change instance in persitence volatile

 * remove instance, use loader instance cache instead
 * change id delete old model and save new
 * loader cache instance with state object
 * model extends another model storm
 * clearcache outside persistence strategy
 * delete query delete cascade
 * cache instance for query
 * advance cloning on query
 * load dependents in query mode
 * add order rand for query
 * better load dependents
 * reset has_many on add remove
 * default unique = true for dependents